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.PEERS. PHOTDLWPNER, WASHINGTON, D C.

Patented Oct. 19,1880,

AU 113 L ATENT OFFICE.

ENRICO ROSENZI, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR OF ONE- FOURTH OF HIS RIGHT TO T. J. MALONEY, OF SAME PLACE.

BLOW-PIPE FOR BLOWING GLASS.

SPECIFICATION forming' part 'of Letters Patent No. 233,550, dated October 19, 1880,

Application tiled July 12,1830. (No model.)

To all whom. it may concern: Be it known that. I, ENRICO Itosnnzr, ot Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Blow-Pipes for Blowing Glass; and I do hereby declare the following to be full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it pertains 1o to make and use it, reference being had to the accompanying drawings, which forni part of this specification.

My invention relates to an improvement. in blow-pipes for blowing glass; and it consists in making the bulb at the end of the blow-pipe by which the glass to be blown is lifted from the mass in the oven separate, and of adit'erent material from that of the pipe.

VHeretofore it has been customary to make 2o the blow-pipes for blowing glass in one piece of soft iron, the pipe or tube being united with the bulb. The bulb or enlarged end ofthepipe is used for lifting a portion ot' the molten glass from the oven to be blown into shape or molded. When this is accomplished the glass, having cooled during the process and become brittle, is knocked ott from the bulb.

When broughtin contact with the hot glass the iron bulb becomes heated and oxidized, and 3o oxygen emitted bythe iron combines with the hot glass, imparting to it a greenish tint or film that destroys its transparency to some extent. Thus, although the glass when first melted may be colorless, as soon as it is taken from the oven 35 to be blown it loses its clearness more or less from its contact with the iron bulb. Moreover, when the blown glass with its greenish film is knocked ofi' from the bulb small fragments fall to the ground, and these shattered pieces 4o are gathered to be remelted with the new material; consequently the new material already partakes, to some extent, of the green tint before it is lifted from the oven to be blown into shape.

To avoid theoxidizing and consequent staining of the glass I separate the bulb from the pipe and make it of adift'erent material, as described hereinafter.

The accompanying drawings represent my 5o invention.

Figure l shows a blow-pipe as now in use. Fig. 2 represents the pipe without the bulb. Fig. 3 represents the bulb detached from the pipe.

The form ot' the pipe differs from the old 55 blow-pipes in being cut ott from the bulb at a suitable length, and provided at that end with a screw that is to enter into the bulb to form a connection. The bulb is in the shape ot a pear, and has in its tapering end a mother- 6o screw for the reception of the screw on the pipe. The two parts when connected are made tight, so that the air blown into the pipe cannot escape but through the hole passing longitudinally through the. bulb.

I make the bulb ot' tire-clay', fr )sum oran other material capable ol resisting a lilgh dg: gree ot' heat without oxidz'ztion when brought in contact with hot glass. The material employed is, by mixing it with fluids, reduced to 7o a plastic pulp and then molded into the proper form and dried. Theuid I use in making the pulp consists of five pounds ofgr-llilI ig-.Lsitl-t,e one-half pound of alum. and twe ve pin s o water to every one isand pounds of clay,

`a1'1d"h"ardens the clay or gypsum and inlpI rfs tenacity to it. The Glau'her's salt neutralizes all uncombined oxygen contained in the gypsum, so that the gypsum is practically free of all uncombined oxygen while used in this con- 8o neetion. Then suiiciently dry and hardened the iron pipe is screwed into the bulb, and when the latter is worn out or becomes broken a new one is readily put in place of the old one.

Although the described separation of the 8 5 bulb from the pipe is to be preferred, the bulb ofthe blow-pipe now in usemay be dipped into a mixture of the aforesaid materials made of a thickness to adhere andform a covering to the bulb sufficient to preventa contact of the iron 9o with the glass. A covering of this kind may be readily knocked off and renewed when required, and the blowpipes now in general use be retained. It would be necessary to put a plu g into the opening of the bulb to prevent its becoming filled by the mixture of clay, gypsum, or other substances forming the covering, which plug is only to be removed when the temporary coating has become dry. The

blow-pipe may also be made in one piece of roo the same material with the bulb hereinbefore described, the same fluid for hardening the pulp being added and mixed with it.

Having thus described my invention, I claiml. A blow-pipe for blowing glass, composed ot two pieces, a pipe and a pear-shaped bulb, ofdiierentmaterial, substantially asdescribed.

2. A blow-pipe for blowing glass, oniposed oftwo pieces, a pipe and a bulb, screwed together, the latter being made of fire-clay, gypsum, or other kindred material free from uncombined oxygen and capable of resisting a high degree ofheat, substantially as described.

3. A blow-pipe for blowing glass, composed entirely of {ire-clay, gypsum, or other material free from uncoxnbined Oxygen and capable of resisting a high degree of heat, substantially as described.

4. A covering or surrounding for the bulb 2o of a blow-pipe for blowing glass, consisting of a mixture of tire-clay, gypsum, or other material, with a fluid which neutralizes the uneombined oxygen in the gypsum and hardens the clayey mixture and prevents the oxidizing of glass, 25 substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this 26th day of June, 1880.

ENRICO ROSENZI.

Witnesses T. F. LEHMANN, LOUIS MOESER. 

